Tankless heater and by-passing valve construction therefor



Dec. 29, 1953 H. w. CARTER 2,664,275

TANKLESS HEATER AND-BY-PASSING VALVE CONSTRUCTION THEREFOR Filed April18, 1950 2 Sheets-Sheet 1 /8 l6 INVENTOR [fairly W Uarer AAATTORNEY Dec.29; 1953 H. w. CARTER TANKLESS HEATER AND BY-PASSING VALVE CONSTRUCTIONTHEREFOR 2 Sheets-Sheet 2 Filed April 18, 1950 INVENTOR y W Carter 356 AATTORNEY- Patented Dec. 29, 1953 OFFICE TANKLESS HEATER AND BY-PASSINGVALVE CONSTRUCTION THEREFOR Harry W. Carter, Flushing, N. Y. ApplicationApril 18, 1950, Serial No. 156,560 I 2 Claims. (Cl. 257-248) Thisinvention relates to domestic hot water heating installations, moreparticularly to a tankless heater, and still more particularly to atempering valve for a tankless heater.

iv My invention is concerned with a domestic hot water heating system inwhich a heating medium is circulated in heat exchang relationship to aheat exchanger, tosupply domestic hot water without storage. Systems soinstalled employ under thermostatic responsive valves control anaddition of tempering water to the outlet end of the heat exchanger, tosupply hot water by an evenly controlled temperature. Such Systems areexpensive both in the installation involved as well as in thelabor'necessary for making the installation. I

I have found that considerable economy can be effected and a highlyeificient installation procured in a domestic hotwater heating systemwherein hot water is circulated in heat exchange relationship to a coiland tempering the hot water so secured from the heat exchanger by amanual setting of a by-pass valve to temper the hot water supply.--

Specifically, I have combined in a domestic hot water heating system atankless heat exchanger serving as the means for supplying domestic hotwater with a tempering valve of compact and low cost constructionwhereby manual control of the tempering water is effected in the hotwater line emerging from the heat exchanger, to provide an installationeffecting considerable economy in cost of material and labor forinstallation.

To attain these objects and such further objects as may appear herein orbe hereinafter pointed out I make reference to the accompanying drawing,forming a part hereof, in which- Figure 1 is a schematic view showing myinstallation Figure 2 is a magnified sectional view of the tankless heatexchange unit employing my invention;

Figure 3 is an end elevation of Figure 2, looking in the direction ofthe arrows 22;

Figure 4 is a magnified section taken on the line 44 of Figure 3.

Summarizing my invention, it is an object thereof to provide in thecirculating system of a hot water heating system a domestic hot watersupply of exceedingly low cost, which eliminates the necessity for usinga storage tank and employs the circulating liquid of the heating systemto heat water in a heat exchanger at temperatures in excess of thatuseable for domestic hot water supply, and to include a low cost andcompact valve installation for the heat exchanger in the nature of acover-flange wherein the outlet water has bled or by-passed into ittempering unheated water which is manually controlled.

Making reference to the drawing, I show a hot water boiler [0 which hasa riser l I, leading to a pipe-line l2 in advance of a flow valve (notshown). A T-joint I3 is connected to a casing 14 by the inlet boss I 5.The casing I4 has an outlet boss I6 for the line H for the return flowto the boiler it. Hot water from the boiler is circulated through thecasing by convection or otherwise, by positive circulation. The casingl4 has a flange l8, to which may be bolted the cover IS. The casing hasinternal bosses 20 and 2| for the inlet end 22 and outlet end 23,respectively, of the coils 24 which are convoluted within the casing l4about the baffle plate 25.

Hot water comprising the heating medium illustrated from the heatingsystem [0 may thereby be brought in heat exchange relationship with thecoils 24, the axial line through the casing being angularly positionedto the normal vertical plane for purposes which will be readilyunderstood.

The cover l9, at its front end, is provided with bosses 23 and 21contiguous to each other and preferably connected by a solid web 28. Oneof the bosses, preferably the upper, has integrally formed therewith theangle boss 29, whose axial line is at right angles to the axial linethrough the bosses 26 and 21. The bosses 26 and 21 are bored and tappedat 30 and 3|, respectively, for screw-threaded connection, for purposeswhich will appear as this description proceeds.

Rearwardly of the tapped portion the web 28 is formed with a by-pass orbleeding port 32, joining the borings 30 and 3|. A seat 33 receives theneedle portion 34 of a needle valve 35, which is mounted for screw feedin the neck 36 of the boss 29. A (counterboring 31 holds a packing 38about the shank 39 of the needle valve. A pack ing gland 40,screw-threadedly holds the packing in sealing position about the shank39 of the needle valve and also has a restricted aperture adjacent theneck 4| for the head 42. A keying slot 43 for a screw driver or the likeinstrumentality is formed at the end of the needle valve shank formanually seating or unseating the needle valve on the seat 33.

With this installation, the inlet line 44 from the cold water supply isconnected to the boss 21. The hot water outlet line 45 is connected tothe boss 26. By the installation provided, it will be observed that theinlet cold water may enter the coils through the end 22 of the coils andleave for domestic consumption through the outlet 23. The heat exchangerelationship of the coil to the casing l4 may heat the water unduly highfor consumption and for this purpose cold water coming into the coil maybe by-passecl through the port 32, past the seat 33, to flow outwardlythrough the line 45, to temper the excessively hot water to the desiredextent.

Manual adjustment of the needle valve shank 39 to move the conicalportion 34 from the seat will increase the flow of cold tempering fluid.Adjustment tending to seat the conical section of the needle valve 34 onits seat will shut off the tempering valve, by-pas ing cold water togive the maximum fiow of hot water.

The provision of a casing flange cover having the connecting bossescontiguous to each other, with a connecting web, serves as a means forproviding a low cost byepassing and tempering valve which may bemanually controlled to require the minimum amcunt of steam-fitters laborfor installation.

Accessibility is afforded for making the adjustment, with no possibledisruptive effect. Efflcient operation is assured in the relationship offlow of the hot water to the shank of the needle valve and its positionin relation to the bleed or by-passing port.

Having thus described my invention and illustrated its use, what I claimas new and desire to secure by Letters Patent is:

1. In combination with a heating coil having inlet and outlet terminalscontiguously positioned. for a tankless heat casing having a flange, asupporting cover member forconnecticn to the flange of said casing, saidcover having a contiguously positioned set of bosses thereon on one facethereof arranged to be on the inside of said casing and integraltherewith, and in which said terminals of said coil are arranged to bemounted, a second set of bosses in parallelism with each other extendingon the outer opposite face of said cover having a common connecting web,said second set of bosses being in communication respectively with saidfirst set of bosses, a by-pass port transversely extended between saidsecond set of bosses through said Web and a manually controlled valvefor adjusting the opening of said port diametrically extended throughone of said second set of bosses.

2. In combination with a heating coil having inlet and outlet terminalscontiguously positioned for a tankless heat casing having a flange, asupporting cover member for said coil for connection to the flange ofsaid casing, said cover having a contiguously positioned set of bossesthereon on one face thereof arranged to be on the inside of said casingand integral therewith in which said terminals of said coil are arrangedto be mounted, a second set of bosses on the outer face of the cover inparallelism with each other, a connecting web between said latter bossesforming a common wall between said bosses, a by-pass port in said webextending through said common wall, said second set of bosses being incommunication respectively with said first set of bosses, a valve seatfor said port on one side of said wall within one of said bosses and amanually controlled valve for said valve seat having a guide adjacentone of said bosses and extending diametrically through the same to thewall common to the other boss.

HARRY W. CARTER.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 111,621 Dreyfus Feb. 7, 1871 757,846 Simpson Apr. 19, 19 4867,942 Bobrick Oct. 15, 1907 1,780,242 Replogle Nov. 4, 1930 1,835,323Olson et a1. Dec. 8, 1931 1,934,495 Glisson 1 Nov. 7, 1933 2,047,864Fite July 14, 1936 2,257,442 Yula Sept. 20, 1941

